PREGNANE DERIVATIVES AND PROCESS FOR THEIR PREPARATION
申请人:KURARAY CO., LTD.
公开号:EP0321572A1
公开(公告)日:1989-06-28
Pregnane derivatives represented by general formula (I) (wherein A1 represents a hydrogen atom or a hydroxy group, A2 represents a substituent such as a hydroxy group when A1 represents a hydrogen atom, or A2 represents a hydrogen atom when A1 represents a hydroxy group, or A1 and A2 are combined together to form an oxo group; 01 represents a substituent such as a hydroxy group, and D2 represents a hydrogen atom, or D1 and D2 are combined together to form an epoxy group or a single bond; D3, D5 and D7 each represents a hydrogen atom, D4 represents a hydroxy group, and D6 represents a substituent such as a hydroxy group, or D3 and D4 may be combined together to form an epoxy group or a single bond, or D4 and D5 may be combined together to form a single bond, D5 and D6 may be combined together to form an epoxy group or a single bond, or D6 and D7 may be combined together to form a single bond; and X1 and X2 each represents a lower alkoxy group or, when combined together, they represent a lower alkylenedioxy or oxo group) and a process for their preparation. The pregnane derivatives are useful as intermediates for synthesizing vitamin D3 having a hydroxy group in the 1α-position.
Pregnane derivatives and processes for production thereof
申请人:Kuraray Co., Ltd.
公开号:US05112998A1
公开(公告)日:1992-05-12
There are provided pregnane derivatives represented by formula ##STR1## wherein A.sup.1 represents a hydrogen atom or a hydroxyl group, A.sup.2 represents a substituent such as a hydroxyl group when A.sup.1 represents a hydrogen atom, or A.sup.2 represents a hydrogen atom when A.sup.1 represents a hydroxyl group, or A.sup.1 and A.sup.2 are combined together to form an oxo group; D.sup.1 represents a substitutent such as a hydroxyl group, and D.sup.2 represents a hydrogen atom, or D.sup.1 and D.sup.2 are combined together to form an epoxy group or a single bond; D.sup.3, D.sup.5 and D.sup.7 each represents a hydrogen atom, D.sup.4 represents a hydroxyl group, and D.sup.6 represents a substitutent such as a hydroxyl group, or D.sup.3 and D.sup.4 may be combined together to form an epoxy group or a single bond, or D.sup.4 and D.sup.5 may be combined together to form a single bond, or D.sup.5 and D.sup.6 may be combined together to form an epoxy group or a single bond, or D.sup.6 and D.sup.7 may be combined together to form a singel bond; and X.sup.1 and X.sup.2 each represents a lower alkoxyl group or, when combined together, they represent a lower alkylenedioxy or oxo group, and a process for their preparation. The pregnane derivatives are useful as intermediates for synthesizing vitamin D.sub.3 derivatives having a hydroxyl group in the 1.alpha.-position.